Kingdom: Animalia Phylum: Mollusca Body Plan: Two Main Regions *Head *Foot mouth Large muscle used sensory organs for locomotion *Visceral mass contains heart, organs of digestion, excretion, and reproduction *Mantle - layer of epidermis covering the visceral mass
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Kingdom: Animalia Phylum: Mollusca Body Plan: Two Main Regions *Head*Foot mouthLarge muscle used sensory organsfor locomotion *Visceral mass contains heart,
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Kingdom: AnimaliaPhylum: Mollusca
Body Plan: Two Main Regions
*Head *Foot
mouth Large muscle used
sensory organs for locomotion
*Visceral mass
contains heart, organs of digestion, excretion, and reproduction
*Mantle - layer of epidermis covering the visceral mass
Phylum: MolluscaClass: Gastropoda
• Stomach Foot
• Conch, snails, abalones (single shell)
• Slugs and nudibranchs (no shell)
• Open Circulatory System – no blood vessels– Organs are bathed in blood
Torsion: during larval development the visceral mass twists around 180 degrees
*allows animal to withdraw inside shell as an adult
• Free swimming, predatory existence• Circle of tentacles with powerful suction cups• Beak• Brain - largest of all invertebrates• Closed Circulatory System• Chromatophores-pigment cells
•Head Foot
•Octopuses, squids, cuttlefish, and chambered nautilus
Squid• Ten tentacles - longest two used for capturing prey• Muscular mantle propels squid with jet propulsion• The giant squid: Architeuthis may reach 43 feet
Worlds 2nd largest invertebrate• Ink Sac• Siphon• Male/Female• Pen (internal skeleton-remnant of shell)• Beak